[The relative amount of slow-adapting stretch receptors in the trachea, extrapulmonary bronchi and lungs of the cat].

In 35 anesthetized cats, local mechanical stimulation determined the location of 185 slow-adapting stretch receptors of the lungs. 79.7% of the receptors were found in the lungs and the rest of them in the trachea and extrapulmonary bronchi. Out of the 20.3% of the latters, 9.3% were located in lobular bronchi, 1.5%--in the main ones, 5.5%--in the trachea bifurcation, 3.3%--in the thoracic portion, and 0.8%--in the cervical portion. The greatest density of the receptors was found in the trachea bifurcation and in lobular bronchi. The amount of the receptors in the lung lobes proved to be proportional to the lobes mass. When analysing the mechanisms of the respiration regulation, one should consider the fact that the relative amount of extrapulmonary tracheobronchial stretch receptors is considerably lesser in cats than in dogs and rabbits.